Wash, core, and roughly chop the apples, including the peel. There's no need to remove the seeds; they'll add extra flavor and natural pectin.
Place the chopped apples into the Instant Pot. Add the cinnamon sticks, whole cloves, grated nutmeg (or ground nutmeg), star anise pods, and brown sugar.
Pour the 8 cups of water over the apple and spice mixture, ensuring that the apples are fully covered.
Secure the Instant Pot lid and set the valve to the sealing position. Select the "Pressure Cook" or "Manual" setting and adjust the time to 10 minutes on high pressure.
Once the cooking time is complete, allow for a natural pressure release (NPR) for about 10-15 minutes. Carefully release any remaining pressure manually.
Use a potato masher or a large spoon to mash the softened apples directly in the Instant Pot. This will release their juices and flavor.
Place a fine-mesh strainer or cheesecloth over a large bowl or pitcher. Carefully ladle the hot spiced apple mixture through the strainer, allowing the liquid to collect in the container below. Use a spoon to press down on the solids to extract as much flavor as possible.
Your Instant Pot Spiced Apple Cider is now ready to be enjoyed. Serve it hot in mugs or cups. Garnish with additional cinnamon sticks or apple slices if desired.
If you have leftover cider, let it cool before transferring it to an airtight container. Refrigerate for up to a week, or freeze it for longer storage.
When reheating, you can add more brown sugar or spices to adjust the sweetness and flavor to your liking.